public class Example4_19 {
   public static void main(String args[]) {
      Student zhang = new Student();
      Student geng = new Student();
      zhang.setAge(23);
      System.out.println("zhang的年龄："+zhang.getAge());
      geng.setAge(25);
      System.out.println("geng的年龄："+geng.getAge());
   }
}
